4:00 p.m.: This post will no longer be regularly updated. For up-to-the-minute reports and analysis about today’s shooting situation at Lone Star College-North Harris, visit TIME.com.

3:45 p.m.: All students have now been evacuated from Lone Star College and the North Harris campus will remain closed for the rest of the day, according to a tweet from the official Lone Star College account. The search for a suspected shooter is taking place in the woods around the campus.

3:24 p.m.: The Lone Star College campuses ban guns of any sort, along with many other weapons, according to the college’s Student Code of Conduct. The shooters in this incident would have been in violation of campus policy by bringing their firearms onto the campus.

3:15 p.m.: Aside from the three injured, a fourth person suffered a heart attack during the shooting, CNN reports.

3:10 p.m.: Lone Star College tweets that the situation is under control, at least inside the college’s seven buildings, though the manhunt remains around the campus. A strong police presence remains around the college, according to reports.

3:05 p.m.: A sheriff’s official tells the Associated Press that three people were wounded in the shooting, with one “person of interest” in custody. But a “wide perimeter” has been established around the campus as the investigation continues.

2:35 p.m.: Police are scouring the North Harris campus of Lone Star College just north of Houston after reports of a shooter on campus has led to a school-wide lockdown. According to the school’s website, an evacuation is in progress: “A couple of armed suspects reported.; injuries reported,” though officials haven’t yet noted how many people were injured.

One person is in custody, according to the Associated Press. But the situation is not yet mitigated. Christina Garza, spokeswoman for the Harris County Sheriff, confirmed to KHOU that police are still looking for another shooter on campus. The shooting was reportedly between two gunmen and was reported at 12:31 p.m. Central time, according to KPRC.

Shots were fired on the campus, a college spokesperson confirmed to Houston ABC affiliate KTRK. Students are being advised to seek shelter in place as police conduct a hunt around the school’s premises, a fairly wooded area 20 miles north of downtown Houston.

According to CNN, Houston Northwest Medical Center has received one patient so far in an incident related to the shooting.

Four schools in the area — an elementary school, two middle schools and a high school — were also placed on lockdown as a precaution.